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<?php $array = [ 'firstname', 'bob', 'lastname', 'alex' ]; $result = []; foreach (array_chunk($array, 2) as [$k, $result[$k]]); var_export($result);
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 'firstname' => 'bob', 'lastname' => 'alex', )

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46.53 ms | 849 KiB | 4 Q